I've heard that video many times and can MAYBE hear a faint slapping/ticking sound in it, but it's pretty faint. I think my dealer would laugh at me if I brought it in for that.

.

As the person that filmed the sound, it is not very faint in person. Any tech that has been servicing E9x M3s will know that sound very well. In any case, if anyone wants more context, please feel free to PM me.